Chemical Technology interview questions

1. A.ammonia and CO2 react at 140–200 bar to ammonium carbamate, which dehydrates to product; unconverted carbamate is stripped and recycled
2. B.ammonia synthesis from nitrogen and hydrogen over promoted iron catalyst at 150–300 bar and 400–500 °C, with about 15% per-pass conversion and recycle
3. C.TiCl4 with alkyl-aluminium co-catalyst giving stereoregular polymers such as isotactic polypropylene and HDPE at low pressure
4. D.brine electrolysis across a cation-exchange membrane giving chlorine at the anode and 32% caustic soda plus hydrogen at the cathode, replacing mercury cells

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1. A.Ziegler-Natta catalyst
2. B.Haber-Bosch process
3. C.Steam cracking
4. D.Portland cement clinker

Answer + AI explanation with Pro

1. A.Haber-Bosch process — pyrolysis of naphtha or ethane at 750–900 °C with dilution steam and sub-second residence time to make ethylene and propylene, followed by rapid quench
2. B.Haber-Bosch process — ammonia synthesis from nitrogen and hydrogen over promoted iron catalyst at 150–300 bar and 400–500 °C, with about 15% per-pass conversion and recycle
3. C.Haber-Bosch process — sulphuric acid manufacture by oxidising SO2 to SO3 over V2O5 at about 450 °C, then absorbing SO3 in 98% acid rather than water
4. D.Haber-Bosch process — ammonia and CO2 react at 140–200 bar to ammonium carbamate, which dehydrates to product; unconverted carbamate is stripped and recycled

Answer + AI explanation with Pro

1. A.brine electrolysis across a cation-exchange membrane giving chlorine at the anode and 32% caustic soda plus hydrogen at the cathode, replacing mercury cells
2. B.sulphuric acid manufacture by oxidising SO2 to SO3 over V2O5 at about 450 °C, then absorbing SO3 in 98% acid rather than water
3. C.ammonia synthesis from nitrogen and hydrogen over promoted iron catalyst at 150–300 bar and 400–500 °C, with about 15% per-pass conversion and recycle
4. D.pyrolysis of naphtha or ethane at 750–900 °C with dilution steam and sub-second residence time to make ethylene and propylene, followed by rapid quench

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1. A.Membrane cell chlor-alkali
2. B.Steam cracking
3. C.Haber-Bosch process
4. D.Contact process

Answer + AI explanation with Pro

1. A.Contact process — limestone and clay burnt near 1450 °C in a rotary kiln to form C3S, C2S, C3A and C4AF phases, then ground with about 5% gypsum
2. B.Contact process — brine electrolysis across a cation-exchange membrane giving chlorine at the anode and 32% caustic soda plus hydrogen at the cathode, replacing mercury cells
3. C.Contact process — endothermic reaction of natural gas with steam over nickel at 800–900 °C to syngas, followed by shift conversion and CO2 removal to give ammonia hydrogen
4. D.Contact process — sulphuric acid manufacture by oxidising SO2 to SO3 over V2O5 at about 450 °C, then absorbing SO3 in 98% acid rather than water

Answer + AI explanation with Pro

1. A.sulphuric acid manufacture by oxidising SO2 to SO3 over V2O5 at about 450 °C, then absorbing SO3 in 98% acid rather than water
2. B.ammonia and CO2 react at 140–200 bar to ammonium carbamate, which dehydrates to product; unconverted carbamate is stripped and recycled
3. C.endothermic reaction of natural gas with steam over nickel at 800–900 °C to syngas, followed by shift conversion and CO2 removal to give ammonia hydrogen
4. D.ammonia synthesis from nitrogen and hydrogen over promoted iron catalyst at 150–300 bar and 400–500 °C, with about 15% per-pass conversion and recycle

Answer + AI explanation with Pro

1. A.Sugar juice sulphitation
2. B.Contact process
3. C.Ziegler-Natta catalyst
4. D.Urea synthesis

Answer + AI explanation with Pro

1. A.Urea synthesis — TiCl4 with alkyl-aluminium co-catalyst giving stereoregular polymers such as isotactic polypropylene and HDPE at low pressure
2. B.Urea synthesis — clarification of cane juice with lime and SO2 to precipitate impurities before multiple-effect evaporation and crystallisation
3. C.Urea synthesis — endothermic reaction of natural gas with steam over nickel at 800–900 °C to syngas, followed by shift conversion and CO2 removal to give ammonia hydrogen
4. D.Urea synthesis — ammonia and CO2 react at 140–200 bar to ammonium carbamate, which dehydrates to product; unconverted carbamate is stripped and recycled

Answer + AI explanation with Pro

1. A.endothermic reaction of natural gas with steam over nickel at 800–900 °C to syngas, followed by shift conversion and CO2 removal to give ammonia hydrogen
2. B.TiCl4 with alkyl-aluminium co-catalyst giving stereoregular polymers such as isotactic polypropylene and HDPE at low pressure
3. C.sulphuric acid manufacture by oxidising SO2 to SO3 over V2O5 at about 450 °C, then absorbing SO3 in 98% acid rather than water
4. D.brine electrolysis across a cation-exchange membrane giving chlorine at the anode and 32% caustic soda plus hydrogen at the cathode, replacing mercury cells

Answer + AI explanation with Pro

1. A.Portland cement clinker
2. B.Ziegler-Natta catalyst
3. C.Membrane cell chlor-alkali
4. D.Urea synthesis

Answer + AI explanation with Pro

1. A.Membrane cell chlor-alkali — ammonia synthesis from nitrogen and hydrogen over promoted iron catalyst at 150–300 bar and 400–500 °C, with about 15% per-pass conversion and recycle
2. B.Membrane cell chlor-alkali — clarification of cane juice with lime and SO2 to precipitate impurities before multiple-effect evaporation and crystallisation
3. C.Membrane cell chlor-alkali — pyrolysis of naphtha or ethane at 750–900 °C with dilution steam and sub-second residence time to make ethylene and propylene, followed by rapid quench
4. D.Membrane cell chlor-alkali — brine electrolysis across a cation-exchange membrane giving chlorine at the anode and 32% caustic soda plus hydrogen at the cathode, replacing mercury cells

Answer + AI explanation with Pro

1. A.ammonia synthesis from nitrogen and hydrogen over promoted iron catalyst at 150–300 bar and 400–500 °C, with about 15% per-pass conversion and recycle
2. B.pyrolysis of naphtha or ethane at 750–900 °C with dilution steam and sub-second residence time to make ethylene and propylene, followed by rapid quench
3. C.brine electrolysis across a cation-exchange membrane giving chlorine at the anode and 32% caustic soda plus hydrogen at the cathode, replacing mercury cells
4. D.endothermic reaction of natural gas with steam over nickel at 800–900 °C to syngas, followed by shift conversion and CO2 removal to give ammonia hydrogen

Answer + AI explanation with Pro

1. A.Membrane cell chlor-alkali
2. B.Steam cracking
3. C.Urea synthesis
4. D.Contact process

Answer + AI explanation with Pro

1. A.Steam cracking — clarification of cane juice with lime and SO2 to precipitate impurities before multiple-effect evaporation and crystallisation
2. B.Steam cracking — TiCl4 with alkyl-aluminium co-catalyst giving stereoregular polymers such as isotactic polypropylene and HDPE at low pressure
3. C.Steam cracking — brine electrolysis across a cation-exchange membrane giving chlorine at the anode and 32% caustic soda plus hydrogen at the cathode, replacing mercury cells
4. D.Steam cracking — pyrolysis of naphtha or ethane at 750–900 °C with dilution steam and sub-second residence time to make ethylene and propylene, followed by rapid quench

Answer + AI explanation with Pro

1. A.limestone and clay burnt near 1450 °C in a rotary kiln to form C3S, C2S, C3A and C4AF phases, then ground with about 5% gypsum
2. B.endothermic reaction of natural gas with steam over nickel at 800–900 °C to syngas, followed by shift conversion and CO2 removal to give ammonia hydrogen
3. C.ammonia synthesis from nitrogen and hydrogen over promoted iron catalyst at 150–300 bar and 400–500 °C, with about 15% per-pass conversion and recycle
4. D.ammonia and CO2 react at 140–200 bar to ammonium carbamate, which dehydrates to product; unconverted carbamate is stripped and recycled

Answer + AI explanation with Pro

1. A.Membrane cell chlor-alkali
2. B.Haber-Bosch process
3. C.Portland cement clinker
4. D.Steam methane reforming

Answer + AI explanation with Pro

1. A.Portland cement clinker — pyrolysis of naphtha or ethane at 750–900 °C with dilution steam and sub-second residence time to make ethylene and propylene, followed by rapid quench
2. B.Portland cement clinker — TiCl4 with alkyl-aluminium co-catalyst giving stereoregular polymers such as isotactic polypropylene and HDPE at low pressure
3. C.Portland cement clinker — limestone and clay burnt near 1450 °C in a rotary kiln to form C3S, C2S, C3A and C4AF phases, then ground with about 5% gypsum
4. D.Portland cement clinker — clarification of cane juice with lime and SO2 to precipitate impurities before multiple-effect evaporation and crystallisation

Answer + AI explanation with Pro

1. A.ammonia synthesis from nitrogen and hydrogen over promoted iron catalyst at 150–300 bar and 400–500 °C, with about 15% per-pass conversion and recycle
2. B.clarification of cane juice with lime and SO2 to precipitate impurities before multiple-effect evaporation and crystallisation
3. C.ammonia and CO2 react at 140–200 bar to ammonium carbamate, which dehydrates to product; unconverted carbamate is stripped and recycled
4. D.limestone and clay burnt near 1450 °C in a rotary kiln to form C3S, C2S, C3A and C4AF phases, then ground with about 5% gypsum

Answer + AI explanation with Pro

1. A.Membrane cell chlor-alkali
2. B.Sugar juice sulphitation
3. C.Steam cracking
4. D.Haber-Bosch process

Answer + AI explanation with Pro

1. A.Sugar juice sulphitation — clarification of cane juice with lime and SO2 to precipitate impurities before multiple-effect evaporation and crystallisation
2. B.Sugar juice sulphitation — sulphuric acid manufacture by oxidising SO2 to SO3 over V2O5 at about 450 °C, then absorbing SO3 in 98% acid rather than water
3. C.Sugar juice sulphitation — ammonia synthesis from nitrogen and hydrogen over promoted iron catalyst at 150–300 bar and 400–500 °C, with about 15% per-pass conversion and recycle
4. D.Sugar juice sulphitation — brine electrolysis across a cation-exchange membrane giving chlorine at the anode and 32% caustic soda plus hydrogen at the cathode, replacing mercury cells

Answer + AI explanation with Pro

1. A.brine electrolysis across a cation-exchange membrane giving chlorine at the anode and 32% caustic soda plus hydrogen at the cathode, replacing mercury cells
2. B.ammonia and CO2 react at 140–200 bar to ammonium carbamate, which dehydrates to product; unconverted carbamate is stripped and recycled
3. C.ammonia synthesis from nitrogen and hydrogen over promoted iron catalyst at 150–300 bar and 400–500 °C, with about 15% per-pass conversion and recycle
4. D.TiCl4 with alkyl-aluminium co-catalyst giving stereoregular polymers such as isotactic polypropylene and HDPE at low pressure

Answer + AI explanation with Pro

1. A.Contact process
2. B.Sugar juice sulphitation
3. C.Ziegler-Natta catalyst
4. D.Steam methane reforming

Answer + AI explanation with Pro

1. A.Ziegler-Natta catalyst — TiCl4 with alkyl-aluminium co-catalyst giving stereoregular polymers such as isotactic polypropylene and HDPE at low pressure
2. B.Ziegler-Natta catalyst — ammonia and CO2 react at 140–200 bar to ammonium carbamate, which dehydrates to product; unconverted carbamate is stripped and recycled
3. C.Ziegler-Natta catalyst — limestone and clay burnt near 1450 °C in a rotary kiln to form C3S, C2S, C3A and C4AF phases, then ground with about 5% gypsum
4. D.Ziegler-Natta catalyst — brine electrolysis across a cation-exchange membrane giving chlorine at the anode and 32% caustic soda plus hydrogen at the cathode, replacing mercury cells

Answer + AI explanation with Pro

1. A.ammonia synthesis from nitrogen and hydrogen over promoted iron catalyst at 150–300 bar and 400–500 °C, with about 15% per-pass conversion and recycle
2. B.sulphuric acid manufacture by oxidising SO2 to SO3 over V2O5 at about 450 °C, then absorbing SO3 in 98% acid rather than water
3. C.pyrolysis of naphtha or ethane at 750–900 °C with dilution steam and sub-second residence time to make ethylene and propylene, followed by rapid quench
4. D.endothermic reaction of natural gas with steam over nickel at 800–900 °C to syngas, followed by shift conversion and CO2 removal to give ammonia hydrogen

Answer + AI explanation with Pro

1. A.Haber-Bosch process
2. B.Steam methane reforming
3. C.Portland cement clinker
4. D.Sugar juice sulphitation

Answer + AI explanation with Pro

1. A.Steam methane reforming — pyrolysis of naphtha or ethane at 750–900 °C with dilution steam and sub-second residence time to make ethylene and propylene, followed by rapid quench
2. B.Steam methane reforming — endothermic reaction of natural gas with steam over nickel at 800–900 °C to syngas, followed by shift conversion and CO2 removal to give ammonia hydrogen
3. C.Steam methane reforming — clarification of cane juice with lime and SO2 to precipitate impurities before multiple-effect evaporation and crystallisation
4. D.Steam methane reforming — ammonia synthesis from nitrogen and hydrogen over promoted iron catalyst at 150–300 bar and 400–500 °C, with about 15% per-pass conversion and recycle

Answer + AI explanation with Pro